How to reverse a C-Style String Interview Question

Q. Write code to reverse a C-Style String  (C-String means that “abcd” is represented as five characters, including the null character )

A.)

This is a classic interview question   The only “gotcha” is to try to do it in place, and to be care-ful for the null character

void reverse(char *str) {

   char * end = str;

   char tmp;

   if (str) {

     while (*end) {

       ++end;

     }

     --end;

     while (str < end) {

        tmp = *str;

        *str++ = *end;

        *end-- = tmp;

      }

    }

  }